z/OS User Exits › z/OS Batch User Exits › TIRBRTRX—Default Retry Limit Exit › Customizing the Exit

Customizing the Exit

The TRANSACTION RETRY LIMIT will be initialized to this value at the beginning of each new transaction. This value may subsequently be modified by a SET TRANSACTION RETRY LIMIT statement in an action diagram.

The TRANSACTION RETRY LIMIT is used to specify the maximum number of times a transaction is to be retried when one of the following events occurs:

• A RETRY TRANSACTION action diagram statement executes.
• A deadlock or timeout occurs trying to access a database, and no WHEN DATABASE DEADLOCK OR TIMEOUT statement was provided for that entity action statement.

In either of these cases, any uncommitted database updates will be rolled back, and an attempt will then be made to execute the application again. Once the number of retries, as indicated by the TRANSACTION RETRY COUNT system attribute, reaches either TRANSACTION RETRY LIMIT or the value specified by the Ultimate Retry Limit Exit, no more retries can occur, and the application will fail with a runtime error if the last retry attempt was unsuccessful.

Modify the copied exit as needed. When you have completed your modifications, install the exit as described in Customizing and Installing z/OS User Exits.